Bake for 18 to 20 minutes. Remove from oven, and immediately sprinkle with marshmallows and morsels. Bake for 3 to 4 minutes longer, or until marshmallows are puffed. Sprinkle with crushed candy. Cool completely in pan (about 1 hour).

To serve, lift foil to remove uncut bars from pan. Place on a cutting board. Fill a pitcher with hot water. Place a long, sharp knife in pitcher. Using warm knife, cut into 9 large squares.